Safety helmet



FIG. 1 is a perspective view of a safety helmet showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a cross-sectional view taken along line VII--VII of FIG. 6. 

The ornamental design for a safety helmet, as shown and described. 